Q. Which hormone increases the rate of almost all chemical reactions in all cells of the body?

A
Cortisol
B
Thyroxine
C
Oxytoxin
D
Adrenaline
Solution:

Thyroxine is the main hormone secreted into the bloodstream by the thyroid gland. It is the inactive form and most of it is converted to an active form called triiodothyronine by organs such as the liver and kidneys.

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